Question

Solve simultaneously equations

13) x/3 - y/4 = 5
X/2. + y/3 = -1

Answer 1

this is history?

Answer 2

Go to mathematics and post that.

Answer 3

x/3 - y/4 = 5 (multiply by the LCD which is 12)
4x - 3y = 60

x/2 + y/3 = -1 (multiply by the LCD which is 6)
3x + 2y = -6

now we have :
4x - 3y = 60 -->(2)
3x + 2y = -6 -->(3)
----------------
8x - 6y = 120 (result of multiplying by 2)
9x + 6y = -18 (result of multiplying by 3)
----------------add
17x = 102
x = 102/17
x = 6
now sub 6 in for x in either equation
3x + 2y = -6
3(6) + 2y = -6
18 + 2y = -6
2y = -6 - 18
2y = - 24
y = -12

check...
x/2 + y/3 = -1
6/2 + (-12/3) = -1
3 - 4 = -1
-1 = -1 (correct)

x/3 - y/4 = 5
6/3 -(-12/4) = 5
2 + 3 = 5
5 = 5 (correct)

x = 6 and y = -12

Answer 4

You should be glad you have someone smart in Mathematics here!

Answer 5

Thank you Kfins :)